Unit 22: Condensers - Quiz (CRF)-Mr.Graham

1. Why are some water-cooled condensers cleaned with brushes and others with chemicals?

• a. Some water-cooled condensers will accumulate scale while others do not.

• b. Some condenser tubes are not straight and will not allow brushes to pass through them.

• c. All water-cooled condensers are hermetically sealed and cannot be cleaned with brushes.

• d. Chemicals are only used on outdoor condensers, indoor condensers are cleaned with brushes.

The three materials of which air-cooled condensers are normally made are __________.

• brass, aluminum, and cast iron

• brass, copper, and steel

• copper, aluminum, and steel

• copper, cast iron, and brass

One of the differences between air-cooled and water-cooled condensers is the __________.

• type of refrigerant used

• refrigerant condensing temperature

• type of compressor used

• compressor discharge line temperature

When is the most heat removed from the refrigerant in the condensing process?

• During the change in state from a vapor to a liquid

• When the refrigerant vapor enters the receiver

• When the liquid refrigerant leaves the condenser

• During the change in state from a liquid to a vapor

After heat is absorbed into the water in a water-cooled condenser, the water can be __________.

• filtered and used for drinking water

• treated with chemicals and piped to a chiller

• filtered and then treated with chemicals before being reused domestically

• wasted down the drain or sent to a cooling tower

When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be _______ above the ambient air temperature.

• 15°F

• 30°F

• 45°F

An outdoor air-cooled condenser that has a vertical coil can be affected by the ___________.

• prevailing winds

• municipal water temperature

• indoor ambient temperature

• refrigerant oil type

Air-cooled condensers are _____________.

• much more efficient than water-cooled condensers

• less efficient than water-cooled condensers

• being phased out due to their inefficiencies

• the most efficient condensers on the market

The type of condenser that has straight copper tubes that are fastened into an end sheet within a steel shell that is typically used in large installations is the _________ condenser.

• air-cooled

• shell-and-coil

• shell-and-tube

• tube-within-a-tube

When the hot discharge gas enters the compressor, it is first __________.

• vaporized

• condensed

• subcooled

• de-superheated